An assembled composite prefabricated box culvert

Abstract

The application relates to the technical field of box culvert construction, and discloses an assembled composite prefabricated box culvert, which is used to solve the problems of structural safety, large space occupation during transportation of the prefabricated box culvert and the need of additional connecting pieces between the box culverts during assembly of the box culverts, by setting the bottom die and the top die into L-shaped plates with an included angle of 90 degrees, which can reduce the space occupied by the die during transportation, and can facilitate positioning and fixing of the top die and the bottom die during assembly of the top die and the bottom die; during the fixing process, the top die and the two bottom dies are connected in a staggered mode, so that the combined box culverts form a stable whole, the safety of the components of the composite box culvert during transportation is ensured, and the purpose of easy transportation and staggered assembly is achieved.

Description

Technical Field

[0001] This application relates to the technical field of box culvert construction, and in particular to a prefabricated composite box culvert. Background Technology

[0002] Box culverts have been widely used in water conservancy projects, municipal engineering projects, and transportation engineering projects. They are mainly used in flood discharge channels, urban sewage pipelines, underground pedestrian passages, and underground vehicular tunnels. Currently, box culvert construction generally adopts on-site casting. In practice, this requires not only setting up concrete molds on-site beforehand but also waiting for the concrete to solidify after casting, resulting in a relatively long construction period, with most of the construction time spent on the box culvert construction. The long casting and curing times of box culverts significantly affect the construction progress, prolonging the project duration and wasting considerable manpower and resources.

[0003] While prefabricated box culverts can accelerate construction, the overall square shape presents some inconveniences in actual use. Firstly, these box culverts are difficult to transport, posing a significant challenge. Secondly, additional connectors are needed during assembly, increasing on-site construction time and significantly complicating assembly if space is limited. Summary of the Invention

[0004] This application proposes a prefabricated composite box culvert, which has the advantages of easy transportation and staggered assembly, in order to solve the problems mentioned in the background art of component safety, large space occupation during transportation of prefabricated box culverts, and the need for additional connecting parts between box culverts during assembly.

[0005] To achieve the above objectives, this application adopts the following technical solution: a prefabricated composite box culvert, comprising: a bottom mold and a top mold, both L-shaped to reduce transportation space; a fixing screw, disposed at the end of the bottom mold, and a cylindrical through hole corresponding to the fixing screw is opened on the top mold; fixing bolts, screwed onto the fixing screws for fastening the bottom mold and the top mold; the top mold is aligned and installed onto the bottom mold by the fixing screws, and the fixing bolts are used to fasten the top mold onto the bottom mold; the bottom mold and the top mold are themselves 90 degrees apart to achieve the positioning and assembly of the square box culvert.

[0006] Furthermore, the end of the bottom mold is divided into four equal parts, and two fixing screws are symmetrically arranged in the dividing line at the end of the bottom mold; when the bottom mold and the top mold are connected in a staggered manner, the fixing screws cooperate with the top mold to position the adjacent bottom molds, and the top mold connects and fixes the adjacent bottom molds.

[0007] Further, it further includes: a positioning rod fixedly connected to one side of the bottom die; a positioning hole opened on the other side of the bottom die and coaxial with the positioning rod; the positioning rod is inserted into the positioning hole to enable quick pre-positioning when the bottom dies are continuously arranged.

[0008] Further, it further includes: the fixing screw is movably installed in the bottom die; a tightening stop block fixed to the bottom end of the fixing screw and simultaneously movable in the middle of the bottom die, a tightening arc portion is provided on one side of the tightening stop block, and an anti-detachment straight portion is fixed to the bottom of the tightening stop block; a guide frame movably installed in the middle of the bottom die, and the surface of one side of the tightening stop block slides relative to the surface of the guide frame; a quick-fixing pull rod fixedly installed at one end of the guide frame, and the center line of the quick-fixing pull rod is perpendicular to the center line of the fixing screw; a lock head provided at one end of the quick-fixing pull rod, and when the quick-fixing pull rod is pulled towards the middle of the bottom die, the lock head can press against the outside of the top die, so that the lock head pushes the top die towards the bottom die to realize the connection and fixation between the bottom die and the top die; a detection stop rod provided on the surface of the guide frame.

[0009] Further, the shape of the anti-detachment straight portion is rectangular, and the width of the anti-detachment straight portion is 1.2 - 1.5 times the width of the tightening arc portion.

[0010] Further, it further includes: a fastening tooth seat movably installed in the middle of the quick-fixing pull rod; a return hook fixed to the end of the fastening tooth seat and located on one side of the tightening stop block; a return spring for connecting the end of the return hook and the inner side of the bottom die; a return pull rod fixedly installed on the surface of the tightening stop block and located inside the return hook; an adjustment local gear installed inside the end of the quick-fixing pull rod and fixedly connected to the lock head; an intermediate gear installed inside the end of the quick-fixing pull rod for realizing the transmission between the adjustment local gear and the fastening tooth seat.

[0011] Further, the surface shape of the return hook is in the shape of "凵".

[0012] Further, the return pull rod is approximately L-shaped, and the included angle between the inner sides of the return pull rod is between 110° - 135°.

[0013] Further, the adjustment local gear drives the lock head to deflect between 0° - 90°.

[0014] Further, it further includes: an installation boss provided on one side of the end of the top die and coaxial with a cylindrical through hole; a detection center seat movably installed in the bottom die and located inside the positioning hole; the detection stop rod is movably installed in the guide frame close to the positioning hole, and the end of the detection stop rod is tapered; a detection spring provided between the detection stop rod and the guide frame.

[0015] The present invention has the following beneficial effects:

[0016] This application provides a prefabricated composite box culvert, which, by setting an L-shaped bottom mold and top mold, not only reduces the transportation space during transportation, but also uses its own L-shape for positioning and fixation during assembly, thereby achieving the effect of easy transportation and easy assembly.

[0017] At the same time, by using two bottom molds and one top mold in a staggered installation, not only can the square box culvert be assembled normally, but multiple box culverts can also be stably connected together, ensuring the stability of the overall box culvert after assembly.

[0018] In this application, when assembling the bottom and top formwork of the box culvert, a protruding fixing screw is used for positioning. Then, during connection, the fixing bolts are directly screwed onto the fixing screws. The tightening of the fixing screws forces the locking head in the quick-fixing tie rod to extend and fix the top formwork. This allows the two ends of the top formwork to be connected and fixed to the two ends of the bottom formwork simply by tightening the fixing bolts, reducing the complexity of box culvert connection and fixing. Even when assembling the box culvert in relatively limited space, the bottom and top formwork can be quickly assembled simply by placing them in the appropriate positions, greatly increasing the convenience of construction and ultimately achieving the goal of easy and quick fixing. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0020] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0021] Figure 1 A schematic diagram of the front structure for aligning and installing the bottom and top molds;

[0022] Figure 2 A schematic diagram showing the alignment and installation of the bottom and top molds to show the back structure.

[0023] Figure 3 A schematic diagram of the front structure for the misaligned installation of the bottom mold and top mold;

[0024] Figure 4 A schematic diagram of the back structure for the misaligned installation of the bottom mold and top mold;

[0025] Figure 5 This is a three-dimensional structural diagram of the bottom mold;

[0026] Figure 6 This is a three-dimensional structural diagram of the top mold;

[0027] Figure 7 A sectional view of the internal three-dimensional structure after the bottom mold and top mold are installed in a staggered manner;

[0028] Figure 8 for Figure 7Enlarged structural diagram at point A in the middle;

[0029] Figure 9 This is a top half-section view of the top mold;

[0030] Figure 10 for Figure 9 Enlarged structural diagram at point B;

[0031] Figure 11 for Figure 9 Schematic diagram of the cross-sectional structure at the middle EE section;

[0032] Figure 12 for Figure 11 Enlarged structural diagram at point C;

[0033] Figure 13 This is a schematic diagram of the three-dimensional structure of the guide frame after assembly.

[0034] Figure 14 A schematic diagram of the three-dimensional structure of the tightening block;

[0035] Figure 15 A simplified diagram illustrating the bottom / top formwork casting method.

[0036] In the diagram: 1. Bottom mold; 100. Positioning hole; 2. Top mold; 200. Mounting boss; 3. Fixing screw; 300. Fixing bolt; 4. Quick-fixing pull rod; 5. Lock head; 6. Positioning rod; 7. Reset top spring; 8. Detection stop bar; 9. Tightening stop block; 900. Tightening arc; 901. Anti-detachment straight part; 10. Return hook; 11. Fastening gear seat; 12. Guide frame; 13. Return pull rod; 14. Detection center seat; 15. Detection spring; 16. Intermediate gear; 17. Adjustment local gear. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] Example 1

[0039] Please see Figure 5 and Figure 6 It can be seen that both the bottom mold 1 and the top mold 2 are L-shaped. The bottom mold 1 is provided with a fixing screw 3 at its end, and a fixing bolt 300 is screwed into the top of the fixing screw 3. The top mold 2 has a cylindrical through hole corresponding to the fixing screw 3.

[0040] There are two ways to assemble the bottom mold 1 and the top mold 2. The first method is to combine them.Figure 1 and Figure 2 As can be seen, the top mold 2 is aligned and installed onto the bottom mold 1 by the fixing screw 3, and the top mold 2 is fastened onto the bottom mold 1 by the fixing bolt 300. Since both the bottom mold 1 and the top mold 2 are L-shaped, they can not only reduce the space occupied during transportation, but also, during the assembly process, the bottom mold 1 and the top mold 2 are in a 90-degree shape, which can self-position and complete the assembly of the square box culvert, greatly enhancing the efficiency of manual assembly.

[0041] As the second assembly method for box culverts, combined with Figure 3 and Figure 4 It can be seen that the end of the bottom mold 1 is divided into four equal parts, and the two fixing screws 3 are symmetrically arranged on the dividing line of the end of the bottom mold 1. The cylindrical through holes on the top mold 2 are still opened accordingly. Figure 9 It is evident that the distance between the two fixing screws 3 is half the width of the bottom mold 1, and the distance between the fixing screws 3 and the side of the bottom mold 1 is one-quarter of the width of the bottom mold 1. This allows the bottom mold 1 and the top mold 2 to be connected in a staggered manner. The fixing screws 3 not only position the adjacent bottom molds 1 through the top mold 2, but also connect and fix the adjacent bottom molds 1 according to the top mold 2. When multiple box culverts are spliced ​​together, the adjacent bottom molds 1 are fixed according to the top mold 2, ensuring that the continuously spliced ​​box culverts form a whole, making the connection of the box culverts more reliable.

[0042] In this first embodiment, the specific L-shape of the top mold 2 and the bottom mold 1 is utilized, which not only facilitates transportation but also ensures convenient connection during assembly through shape self-positioning, greatly accelerating the connection and fixing speed for construction personnel on site. Furthermore, this first embodiment places the fixing screws 3 in specific positions, allowing the bottom mold 1 and the top mold 2 to be installed not only aligned but also staggered, thus ensuring the entire box culvert forms a unified whole and is more robust.

[0043] The method illustrated in Example 1 offers several significant advantages. It not only inherits the previously mentioned advantages, such as the ability to pre-cast the top / bottom formwork and then directly transport these pre-cast formwork pieces to the construction site for use, thus greatly improving construction efficiency, but also allows the construction team to work in parallel with other preparatory work on the construction site, significantly shortening the project cycle.

[0044] Even more impressive is that, from Figure 15As we can observe, this embodiment also allows the formwork required for pouring to be transported directly to the construction site for pouring operations. This method greatly simplifies the construction process, reduces the number of times materials are transferred between different locations, and thus further accelerates the construction progress. At the same time, on-site pouring also ensures the controllability of construction quality, because construction personnel can check and adjust in real time during the pouring process to ensure that every step meets the design requirements.

[0045] During on-site pouring, a reinforcing cage with sufficient load-bearing capacity must first be rolled out. The reinforcing cage provides stable support for subsequent concrete pouring, and baffles are spliced ​​and fixed to its outer side. These baffles tightly wrap around the reinforcing cage, leaving only an opening at the top to allow for smooth concrete pouring. This method ensures that the top and bottom formwork required for box culvert construction maintains structural stability and integrity during on-site pouring.

[0046] Furthermore, it's worth mentioning that the flat-panel design of the baffles required during construction allows for easy assembly when needed. Simultaneously, the flat design significantly reduces the space occupied during transport, facilitating not only transportation and storage but also making their delivery to the construction site simpler and more efficient. This feature not only lowers construction costs but also further promotes the smooth progress of on-site pouring operations, providing strong support for the successful implementation of the entire project.

[0047] Example 2

[0048] Based on Embodiment 1, a further improvement is made. During the assembly of the bottom mold 1 and top mold 2, the bottom mold 1 needs to be placed in the required position first. To ensure that multiple bottom molds 1 can be aligned and placed, and to facilitate the later connection and fixation of the top mold 2, please refer to [reference needed]. Figures 1-4 It is evident that a positioning rod 6 is fixedly connected to one side of the bottom mold 1, and a positioning hole 100 coaxial with the positioning rod 6 is opened on the other side of the bottom mold 1. The positioning rod 6 can be inserted into the positioning hole 100, so that when multiple bottom molds 1 are arranged continuously, the positioning rod 6 can be inserted into the positioning hole 100 to achieve quick pre-positioning when the bottom molds 1 are arranged, which makes it easier for the top mold 2 to install the bottom molds 1 in a staggered manner.

[0049] In this second embodiment, the end of the positioning rod 6 is provided with a thread. The positioning rod 6 is screwed into one side of the bottom mold 1 through the thread, so that the bottom mold 1 and the positioning rod 6 can be transported separately during transportation, avoiding the protruding positioning rod 6 from affecting the transportation of the bottom mold 1. During on-site assembly, the positioning rod 6 only needs to be screwed into the bottom mold 1 to achieve the above-mentioned implementation.

[0050] Example 3

[0051] For further improvements based on Example 2, please refer to [link / reference]. Figure 7 and Figure 8 It can be seen that the connection between the bottom mold 1 and the top mold 2 is based on the connection and fixation of the two ends of the top mold 2 and the two ends of the bottom mold 1. Common sense dictates that two fixing screws 3 extending from one end of the bottom mold 1 can be used for installation and positioning. If fixing screws 3 are also arranged at the other end of the bottom mold 1, the top mold 2 needs to be positioned simultaneously with both ends of the bottom mold 1 during installation, which increases the assembly difficulty between the top mold 2 and the bottom mold 1. To facilitate positioning and installation, in this embodiment, the fixing screws 3 are movably installed in the bottom mold 1, and a tightening block 9 that moves in the middle of the bottom mold 1 is fixedly installed at the bottom end of the fixing screws 3. The tightening block 9 can only move up and down along the center line of the fixing screws 3. Figure 14 It can be seen that the shape of the tightening block 9 is not cylindrical. Therefore, the tightening block 9 restricts the fixing screw 3 to only reciprocate up and down in one direction and prevents it from rotating on its own. It also ensures that when the fixing bolt 300 is screwed into the fixing screw 3, the fixing screw 3 will not rotate with the fixing bolt 300.

[0052] Combination Figure 9 and Figure 11 As can be seen, the guide frame 12 is movably installed in the middle of the bottom mold 1, and the side of the tightening block 9 is slidably connected to the surface of the guide frame 12. The movement direction of the guide frame 12 is perpendicular to the center line of the fixing screw 3. A quick-fixing pull rod 4 is fixedly installed at one end of the guide frame 12, and one end of the quick-fixing pull rod 4 is located on the outer side of the end of the bottom mold 1. The center line of the quick-fixing pull rod 4 is perpendicular to the center line of the fixing screw 3. A locking head 5 is provided at one end of the quick-fixing pull rod 4. When the quick-fixing pull rod 4 is pulled towards the middle of the bottom mold 1, the locking head 5 can press against the outer side of the top mold 2, thereby causing the locking head 5 to push the top mold 2 towards the bottom mold 1, thus realizing the connection and fixation between the bottom mold 1 and the top mold 2.

[0053] Combination Figure 11 and Figure 14It can be seen that the surface of the guide frame 12 is provided with a detection stop bar 8, and one side of the tightening block 9 is provided with a tightening arc 900. When the fixing screw 3 drives the tightening arc 900 upward, it will cause the detection stop bar 8 to pull the guide frame 12 to move to the left. The bottom of the tightening block 9 is fixed with an anti-detachment straight part 901. The anti-detachment straight part 901 is rectangular in shape, and the width of the anti-detachment straight part 901 is 1.2 to 1.5 times the width of the tightening arc 900. Therefore, in the actual connection and tightening process, when the fixing screw 3 is tightened by the fixing bolt 300 and moves upward, it will pull the tightening arc 900 upward. The tightening arc 900 pushes the detection stop bar 8 to move to the left, forcing the locking head 5 to press against the top mold. The outer side of mold 2 is pressed towards the end of mold 1, so that one end of mold 2 is fastened by the thread of the fixing bolt 300, and the other end is pressed by the locking head 5 to fasten mold 2 and mold 1. If the locking head 5 is not properly fastened, the tightening arc 900 will continue to rise, so that the detection stop 8 is pressed against the anti-detachment straight part 901. The anti-detachment straight part 901 prevents the tightening stop block 9 from continuing to output upward. At the same time, since the thread length at the top of the fixing screw 3 is limited, when the anti-detachment straight part 901 is pressed against the detection stop 8, the fixing bolt 300 will pass through the thread at the top of the fixing screw 3 and cannot be tightened again. Thus, it is possible to know whether the locking head 5 is properly pressing the mold 2 during the tightening process.

[0054] To prevent the locking head 5 and the quick-fixing pull rod 4 from interfering with the positioning of one end of the top mold 2 and the bottom mold 1, combined with Figures 7-9 It can be seen that in this embodiment, a fastening tooth seat 11 is movably installed in the middle of the quick-fixing pull rod 4, and the fastening tooth seat 11 can only reciprocate in one direction along the axis of the quick-fixing pull rod 4. A return hook 10 located on one side of the tightening block 9 is fixedly installed at the end of the fastening tooth seat 11. The end of the return hook 10 and the inner side of the bottom mold 1 are connected by a reset top spring 7. Due to the elastic force of the reset top spring 7, the return hook 10 always tends to push the fastening tooth seat 11 away from the guide frame 12. Figure 8 It can be seen that the surface shape of the return hook 10 is "U". The surface of the tightening block 9 is fixedly installed with the return rod 13 located inside the return hook 10. The return rod 13 is approximately L-shaped, and the included angle between the inner sides of the return rod 13 is between 110° and 135°. Thus, when the return rod 13 follows the tightening block 9 downward, the return rod 13 pushes the return hook 10 to compress the reset top spring 7, forcing the fastening tooth seat 11 to move towards the detection stop bar 8.

[0055] Combination Figures 11-13It can be seen that the end of the quick-fixing lever 4 is rounded, and an adjusting local gear 17 is movably installed on the inner side of the end of the quick-fixing lever 4. The adjusting local gear 17 is fixedly connected to the lock head 5, so that the lock head 5 can be driven to deflect between 0° and 90° by adjusting local gear 17. An intermediate gear 16 is movably installed in the quick-fixing lever 4 between the adjusting local gear 17 and the fastening gear seat 11. According to the transmission of the intermediate gear 16, when the fastening gear seat 11 moves linearly, the intermediate gear 16 drives the adjusting local gear 17 to rotate, thereby realizing the deflection of the lock head 5.

[0056] During assembly, place the bottom mold 1 in the desired position with the fixing screw 3 facing upwards. At this point, the components are combined... Figure 8 It can be seen that the tightening block 9 descends under its own weight, the tightening arc 900 descends and gradually disengages from the detection stop 8, until the inner corner of the return lever 13 is at the same height as the detection stop 8. At the same time, the return hook 10, under the elastic force of the reset top spring 7, pushes the fastening tooth seat 11 to the right, combined with... Figure 12 It can be seen that the right-moving fastening tooth seat 11 will move to the right limit, at which point the lock head 5 is in a vertically upward state.

[0057] As the tightening stop 9 drives the return lever 13 to continue downward, the return lever 13 pushes the return hook 10 towards compressing the return spring 7. At the same time, the fastening tooth seat 11 moves to the left, combining... Figure 12 It can be seen that the leftward movement of the fastening tooth seat 11 will cause the middle gear 16 to rotate clockwise and the adjustment local gear 17 to rotate counterclockwise, forcing the lock head 5 to deflect towards the bottom mold 1. Since the lock head 5 is blocked by the bottom mold 1 at this time, it will force the lock head 5 to push the quick-fixing pull rod 4 to move away from the bottom mold 1. Combined with the fact that the quick-fixing pull rod 4 is unrestricted at this time and can move left and right, until the fastening tooth seat 11 moves to the left limit, the lock head 5 will then retract into the quick-fixing pull rod 4.

[0058] As the return lever 13 continues to push the fastening tooth 11, the fastening tooth 11, which has moved to its left limit, will push the quick-fixing lever 4 to continue moving to the left, thereby causing the quick-fixing lever 4 to retract to the end of the bottom mold 1, until the quick-fixing lever 4 is completely retracted into the bottom mold 1.

[0059] Since only the fixing screw 3 protrudes outward from the top of the bottom mold 1 at this time, the top mold 2 is positioned and installed on the bottom mold 1 by the fixing screw 3.

[0060] During assembly and fixing, the fixing bolt 300 is screwed into the fixing screw 3. As the fixing bolt 300 is continuously screwed in, it will force the fixing screw 3 to drive the tightening block 9 upward. The return spring 7 will be elastic and move to the right through the fastening tooth seat 11. Since the lock head 5 is retracted into the bottom mold 1 at this time, the lock head 5 cannot be opened. The fastening tooth seat 11 will be elastic and push the quick fixing pull rod 4 to the right until the quick fixing pull rod 4 passes through the cylindrical through hole at the end of the top mold 2. After the lock head 5 passes the top mold 2, it will be forced to deflect clockwise by the rightward force of the fastening tooth seat 11 until the lock head 5 is vertically upward.

[0061] When the detection stop lever 8 is aligned with the inner corner of the return lever 13, the return top spring 7 pushes the fastening tooth seat 11 to the right with maximum force, and the lock head 5 is vertically upward at this time.

[0062] As the fixing screw 3 continues to move upward, the tightening arc 900 on the tightening block 9 pushes the detection stop 8 to the left. At this time, the fastening tooth seat 11 is always inclined to move to the right by the spring force of the reset top spring 7, so that the locking head 5 always maintains a vertical upward state. When the detection stop 8 pushes the guide frame 12 to move the quick fixing pull rod 4 to the left, the vertically upward locking head 5 is pressed against the outside of the top mold 2, thereby fixing the connection between the bottom mold 1 and the top mold 2. As the fixing bolt 300 is continuously tightened, the connection strength between the bottom mold 1 and the top mold 2 by the locking head 5 is continuously increased until the fixing bolt 300 can no longer be tightened. At this time, the strength of the connection between the top mold 2 and the bottom mold 1 by the fixing bolt 300 is the greatest, and the strength of the connection between the bottom mold 1 and the top mold 2 by the locking head 5 is also the greatest.

[0063] If the connection is not normal, the guide frame 12 will move a longer distance to the left when the lock head 5 is not properly hooked on the top mold 2, until the detection stop bar 8 presses on the anti-detachment straight part 901. At this time, the fixing bolt 300 will disengage from the thread at the bottom of the fixing screw 3, and the construction personnel can clearly feel that the fixing bolt 300 is no longer under force. Therefore, it can be quickly known that the lock head 5 has not been properly tightened.

[0064] When reconnection and fixation are required, simply unscrew the fixing bolt 300 from the fixing screw 3. The tightening block 9 will descend under its own weight until the locking head 5 retracts into the quick-fixing pull rod 4. The quick-fixing pull rod 4 will then retract into the end of the bottom mold 1. After that, reconnection and fixation can be performed. This method is also suitable for quick disassembly between the bottom mold 1 and the top mold 2.

[0065] Example 4

[0066] Based on Embodiment 3, this Embodiment 4 is a further improvement. To ensure that when the bottom mold 1 and top mold 2 are misaligned during installation, it is possible to quickly determine if there is an installation gap between the bottom mold 1 and the top mold 2 (this gap may arise from improper installation or excessive manufacturing time intervals). Please refer to [link / reference needed].Figure 6 It can be seen that a mounting boss 200 is fixedly installed on one side of the end of the top mold 2. The mounting boss 200 is coaxial with a cylindrical through hole, so that when the lock head 5 is fastening a top mold 2, the two lock heads 5 on the same bottom mold 1 move and fasten at different distances.

[0067] Combination Figure 9 and Figure 10 It can be seen that a detection center seat 14 located in the positioning hole 100 is movably installed in the bottom mold 1, and the detection center seat 14 can only reciprocate along the positioning hole 100. The detection stop bar 8 is movably installed in the guide frame 12 near the positioning hole 100, and the end of the detection stop bar 8 is tapered. A detection spring 15 is provided between the detection stop bar 8 and the guide frame 12, so that the detection stop bar 8 is always forced to push outward of the guide frame 12 by the elastic force of the detection spring 15.

[0068] When in use, when the bottom mold 1 and the top mold 2 are installed in a misaligned manner, the positioning rod 6 is inserted into the positioning hole 100 and pushes the detection center seat 14 to the right to the limit. After the misaligned installation, the cylindrical through hole without the mounting boss 200 will be fixed with the quick-fixing pull rod 4. At this time, the quick-fixing pull rod 4 is located on one side of the positioning hole 100, while the cylindrical through hole with the mounting boss 200 is located in the quick-fixing pull rod 4 on the side closer to the positioning rod 6.

[0069] Because the quick-fixing pull rod 4 on one side of the positioning hole 100 does not have a mounting boss 200, the distance the quick-fixing pull rod 4 retracts into the bottom mold 1 when it is tightened is increased. This causes the guide frame 12 to push the detection stop 8 to one side of the detection center seat 14. (Direction reference) Figure 10 If there is a gap between the bottom molds 1, the positioning rod 6 inserted into the positioning hole 100 will not push the detection center seat 14 to the right limit position, and the detection stop rod 8 will be pushed against the detection center seat 14 by the elastic force of the detection spring 15. The detection stop rod 8 will disengage from the tightening arc 900 on the tightening block 9, causing the constantly twisted fixing bolt 300 to disengage from the thread at the top of the fixing screw 3, thereby warning the construction personnel that the lock head 5 is not properly hooked and tightened or there is a gap between the bottom molds 1.

[0070] If the bottom mold 1 is too long, the top mold 2 cannot be properly installed with the two bottom mold 1s in a staggered manner. This means that it can be known at the beginning of the installation that the bottom mold 1 cannot be properly fixed with the top mold 2, and the bottom mold 1 or the top mold 2 needs to be replaced.

[0071] If the bottom mold 1 and the top mold 2 are aligned and installed, the mounting boss 200 and the positioning hole 100 are on the same side. At this time, the guide frame 12 moves a relatively short distance after being tightened, and will not cross the detection center seat 14. Therefore, this method is not restricted when aligned and installed.

Claims

1. A prefabricated composite box culvert, characterized in that, include: Both the bottom mold and the top mold are L-shaped to reduce transportation space; A fixing screw is set at the end of the bottom mold, and a cylindrical through hole corresponding to the fixing screw is opened on the top mold; Secure the bottom mold and top mold by tightening the nuts onto the fixing screws. The top mold is aligned and installed onto the bottom mold using fixing screws, and the top mold is then fastened onto the bottom mold using fixing nuts. The bottom mold and top mold are 90-degree angled to achieve the positioning and assembly of the square box culvert; The fixing screw is movably installed in the bottom mold; The tightening block is fixed to the bottom end of the fixing screw and moves in the middle of the bottom mold. A tightening arc is provided on one side of the tightening block, and an anti-detachment straight part is fixed at the bottom of the tightening block. The guide frame is movably installed in the middle of the bottom mold, and the side of the clamping block slides relative to the surface of the guide frame; The quick-fixing tie rod is fixedly installed at one end of the guide frame, and the center line of the quick-fixing tie rod is perpendicular to the center line of the fixing screw. The locking head is located at one end of the quick-fixing pull rod. When the quick-fixing pull rod is pulled towards the middle of the bottom mold, the locking head can press against the outside of the top mold, causing the locking head to push the top mold towards the bottom mold, thereby achieving the connection and fixation between the bottom mold and the top mold. A detection stop bar is installed on the surface of the guide frame; The fastening toothed seat is movably mounted in the middle of the quick-fixing pull rod; The return hook is fixed to the end of the fastening tooth seat and located on one side of the tightening block; The reset top spring is used to connect the end of the return hook to the inside of the bottom mold; The return lever is fixedly installed on the surface of the tightening block and located inside the return hook; Adjust the local gear, install it on the inner side of the end of the quick-locking rod, and fix it to the lock head; The intermediate gear, installed on the inner side of the end of the quick-fixing pull rod, is used to realize the transmission between the adjustment local gear and the fastening gear seat; During assembly and fixing, the fixing nut is screwed into the fixing screw. As the fixing nut is continuously screwed in, it will force the fixing screw to drive the tightening block upward. The return top spring will be subjected to the elastic force and move to the right through the fastening tooth seat. Since the lock head is retracted into the bottom mold at this time, the lock head cannot be opened. The fastening tooth seat will be subjected to the elastic force of the return top spring and will continue to push the quick fixing pull rod to the right until the quick fixing pull rod passes through the cylindrical through hole at the end of the top mold. After the lock head passes the top mold, it will be forced to deflect clockwise by the force of the fastening tooth seat moving to the right until the lock head is vertically upward. As the fixing screw continues to move upward, the tightening arc on the tightening block pushes the detection stop bar to the left. At this time, the fastening tooth seat is always inclined to move to the right by the spring force of the reset top spring, so that the lock head always maintains a vertical upward state. When the detection stop bar pushes the guide frame and causes the quick fixing pull rod to move to the left, the vertically upward lock head is pressed against the outside of the top mold, thereby fixing the connection between the bottom mold and the top mold.

2. The prefabricated composite box culvert according to claim 1, characterized in that, The end of the bottom mold is divided into four equal parts, and two fixing screws are symmetrically arranged in the dividing line at the end of the bottom mold. When the bottom mold and the top mold are connected in a staggered manner, the fixing screw cooperates with the top mold to position the adjacent bottom mold, and the top mold connects and fixes the adjacent bottom mold.

3. The prefabricated composite box culvert according to claim 1 or 2, characterized in that, It also includes: Positioning rods are fixedly connected to one side of the bottom mold; The positioning hole is located on the other side of the bottom mold and is coaxial with the positioning rod. When the positioning rod is inserted into the positioning hole to achieve continuous arrangement between the bottom molds, rapid pre-positioning can be achieved.

4. The prefabricated composite box culvert according to claim 1, characterized in that, The shape of the anti-detachment straight part is a cuboid, and the width of the anti-detachment straight part is 1.2 - 1.5 times the width of the tightening arc part.

5. The prefabricated composite box culvert according to claim 1, characterized in that, The surface shape of the return hook is in the shape of "凵".

6. The prefabricated composite box culvert according to claim 1, characterized in that, The return pull rod is approximately L-shaped, and the included angle between the inner sides of the return pull rod is between 110° and 135°.

7. The prefabricated composite box culvert according to claim 1, characterized in that, The adjustment local gear drives the lock head to deflect between 0° and 90°.

8. The prefabricated composite box culvert according to claim 1, characterized in that, It further includes: An installation boss is arranged on one side of the end of the top mold and is coaxial with a cylindrical through hole; A detection center seat is movably installed in the bottom mold and is located inside the positioning hole; The detection stop rod is movably installed in the guide frame near the positioning hole, and the end of the detection stop rod is conical; A detection spring is arranged between the detection stop rod and the guide frame.

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